diff --git a/packages/opencode/src/session/prompt.ts b/packages/opencode/src/session/prompt.ts
index 7fac8303e..4db3fec3d 100644
--- a/packages/opencode/src/session/prompt.ts
+++ b/packages/opencode/src/session/prompt.ts
@@ -210,7 +210,7 @@ export namespace SessionPrompt {
   function start(sessionID: string) {
     const s = state()
     if (s[sessionID]) return
-    const loopId = Identifier.ascending("loop")
+    const loopId = ulid()
     const controller = new AbortController()
     s[sessionID] = {
       abort: controller,